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View Actual EPA Method 9215 (PDF File)
EPA Method 9215:POTENTIOMETRIC DETERMINATION OF SULFIDE IN AQUEOUS SAMPLES AND DISTILLATES WITH ION-SELECTIVE ELECTRODE
Summary:The distillations in Methods 9030 and/or 9031 are performed, except that the scrubber solution is sulfide anti-oxidant buffer (SAOB), with ascorbic and salicylic acids added as oxygen scavengers. The distillates are then analyzed potentiometrically using a sulfide ion-selective electrode (ISE) in conjunction with a double-junction reference electrode and a pH meter with an expanded millivolt scale or an ISE meter capable of being calibrated directly in terms of sulfide concentration.
Scope:This method can be used for measuring total sulfide in a distilled sample. The method is meant to be used as an alternate determinative step following the distillation in either SW- 846 Methods 9030 or 9031.
Report Number:SW-846 Ch 5